7/18•(-1 1/4)-(4/21)•(-1 1/6)

Question

7/18•(-1 1/4)-(4/21)•(-1 1/6)

Answer 1

1)7/18*(-1 1/4)=7/18*(-5/4)=-35/72
2)4/21*(-1 1/6)=4/21*(-7/6)=-2/9
3)-35/72-(-2/9)=(-35+16)/72=-19/72